How to refill the e-smart clearomizer:1. Unscrew and remove the mouthpiece.2. Fill with no more than 0.9ml oil. DO NOT pour oil into the center tube.3. Screw the mouthpiece back in clearomizer.4. Allow 1-2 minutes for the E-Juice to feed into the wick and coil before you start to vaping.5. Screw onto your battery and start vaping.